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LEWELLYN MASO N, O F ROCHESTER, NEW YORK.

' Letters Patent No. 72,410, dated December 17, 1867. I

IMPROVED INSTRUMENT FOB. EXPANDING FINGER-RINGS.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, LEWELLYN MASON, of Rochester, in the county of Monroe, and State of New York, have invented a certain new and useful Improvement in Instruments for Expanding or Stretching Finger-Rings; and I do hereby declare that the following is a full and exact description thereof, reference being had to .the accompanying drawings ,'malting part of this specification. I

Figure 1 is apcrspcctive view of my improved instrument.

Figure 2., a longitudinal section of the same.

Like letters of reference indicate corresponding parts in both figures.

My invention consists in a hand-instrument for stretching finger-rings, having stares which are expanded by a. central core of similar form projected and retracted by a screw or equivalent, the reaction of the stares being produced by a spring or springs.

As represented in the drawings, A is a suitable block, forming the hand-rest. From the front end of this block projects the conical shaft I3, made up of a series of stares, a a, which, when placed together, produce a complete circle in cross-section. The reaction of the SlIIH'CS is produced by some suitable arrangement of springs-that represented being springs 12 b, in the form of rings, which contract the stares by their compression, and thus keep them closed. Inside the stares fits a conical core, 0, which is prevented from turning by any suitable device, that shown being a feather, a, sliding in a longitudinal groove, cl, of the block A. The

inner end of the core is shown provided with a female serew,f, in which fits a male screw, g, having on its outer end a wheel, D, by which it is operated. The screw g may be retained against end movement by a rib, h, which fits between shoulders 2', as clearly shown in fig. 2. The end of the core 0 has a scale marked 1, 2, 3, &c.,the distancebetween these numbers beingjust sufficient to'expand the staves the difference between the different sizes of rings.

The operation of this instrument will be readily understood. The finger-ring is placed upon-tho shaft B, I

and the core 0 is then forced outward, expanding the stares, and consequently stretching the ring. This expansion is gauged exactly by the scale 1, 2, 3, 85c. I

By this means finger-rings can be expanded exactly as desired, and in a most expeditious manner. This mode is far preferable to cutting them open and inserting a piece, in which case the ring must be soldered and repolished; or to hammering the ring on a conical mandrel, in which case the surface of the ring is battered and disfigured, and the sides are liable to become of, dill'erent thicknesses. In my device, the outside of the ring is untouched, and all parts expand equally.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The improved instrument for stretching finger-rings, constructed, arranged, and operating substantially as herein set forth.

2. The combination, with the expanding-shaft B and the core 0, of the scale 1, 2, 3, 850., arranged substantially as described.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

LEWELLYN MASON.

Witnesses:

R. F. Oseoon, v J. A, DAVIS. 

